I will test with D3D11, no desktop slideshow I doubt anything is interfering with the playback, cause before I didn't have presentation glitch. Maybe it is from the drivers 382.53 the card is GTX 1050 Ti.

Hey all, I have what I hope is a simple question. I'm now on a 4K LG OLED and I have the gamma set to BT.2020. What should I set for gamma in madvr to match that? I know this is total newbie land here but I'm still learning about the 4K world. Thanks!!!

This isn't a madVR problem specifically I think, but I encounter it when using madVR with resolution switching. Anyone else use RGB 12 bit for 4K 23.976 with Nvidia card and have a problem getting the 12 bit to stick. Works fine if I leave in 23.976, but when switching between 23.976 and other refresh rates like 60 every once in awhile RGB for 4K 23.976 switches back to 8 bit, which of course screws up HDR until manually toggling back to 12 bit.

Thanks. I know 8 bit HDR is technically supported but I thought it wasn't recommended. For some reason image goes mostly pink when sending RGB 8 bit HDR to my JVC projector. Good to know it isn't caused by a limitation of 8 bit HDR.

Yes, I think that is due to the projector not handling it correctly, because all HDR capable hardware players output 10+ bits, rather than a limitation of HDR itself. You do need good dithering to avoid banding with 8 bit HDR content, something that does not live through compression (like the HEVC on a UHD bluray) but does for madVR's output or video games.

Quote:

Originally Posted by huhn

that't a gamma choicen on the black level of a display a oled should respond with a 2.4 gamma in that setting but they obviously don't do that.

Interestingly I do not measure a notable difference between my LG C7's 2.4 and BT.1886 settings, but they are not exactly pure power 2.4 near black either (it actually rises slower, I think to make shadows look very deep). The 2.2 setting is pretty close to 2.2 though.

Thanks. I know 8 bit HDR is technically supported but I thought it wasn't recommended. For some reason image goes mostly pink when sending RGB 8 bit HDR to my JVC projector. Good to know it isn't caused by a limitation of 8 bit HDR.

It's not caused by a limitation of 8bits HDR, it's a bug in the JVCs.

The only thing you need to do to get the JVC to work with HDR 8bits, as reported a few times, is to disable "Send HDR Metadata" if using passthrough, or use the HDR to SDR conversion wiht Pixel Shader.

The magenta bug in the JVCs is far worse with recent nVidia drivers. It's only at 4K60p with 385.28 while it's all 8bits modes with the more recent ones. So it could be nVidia rather than JVC.

I cannot get it to run at 23.976. I've tried custom resolutions specifying 23.976 to no avail. I've been told that only Intel graphic cards will do 23.976. If this is true, I will have to live with a frame repeat every so often and so be it, but can someone confirm?